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    <title>Document</title>
    <script src="../../vue.js"></script>
  </head>
  <body>
    <div id="app"><App></App></div>
    <script>
      Vue.config.productionTip = false;
      // 假设Header组件是一个公共组件，我们可以直接全局注册Header组件，那么就可以在任意组件中直接使用
      const Header = {
        name: "Header",
        template: `<h2>Header</h2>`,
      };
      /* 
        使用Vue.component("组件名称"，组件)对某个组件进行全局注册
      */
      Vue.component("Header", Header);

      const App = {
        name: "App",
        template: `
            <div>
                <h1>App组件</h1>    
               <Header></Header>
            </div>
        `,
      };
      const vm = new Vue({
        el: "#app",
        components: {
          App,
        },
        data() {
          return {};
        },
      });
    </script>
  </body>
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